Utah Shock Wave Therapy Protocol uses innovative acoustic wave energy to treat the surrounding spine muscles that are hyper sensitive, tender & painful. The pressure waves create increased  blood flow and stimulate more blood vessels to help with healing. The outcome ? Decrease in muscle pain & aches, activate connective tissue in joints for better motion and improve blood flow. 
"....we found ESWT to be more effective than TPI ( trigger point injections ) for pain relief....Compared to TPI, ESWT showed superior results for pain relief. Thus, we consider ESWT as an effective treatment for myofascial pain syndrome.... "
Ann Rehabil Med. 2017 Aug; 41(4): 582–588.

Repetitive shock wave therapy improves muscular microcirculation.
J Surg Res. 2016 Apr;201(2):440-5. doi: 10.1016/j.jss.2015.11.049. Epub 2015 Nov 30.

"Shock wave ...... treatment ..... improves skin flap survival through neovascularization [ new blood vessels] and early upregulation of angiogenesis [ a.k.a New blood vessels ] related growth factors.
Ann Surg. 2011 May;253(5):1024-32. doi: 10.1097/SLA.0b013e3182121d6e.